This garden was basically very similar to most of the Japanese gardens that I've experienced in Tokyo. While it had all of the general parts including a pretty pond with islands and beautiful Japanese scenery, the place was small but lively. There were many families, old couples, and people out just for a stroll in the park. The signs around the garden were also in English (romanji) which made navigation very simple, although the garden is small so it wasn't possible to actually get lost.
There were a few areas with snacks available for the hungry visitor and even some picnic tables in one section. It seems like it would be a good spot for a picnic lunch.
I assume that it's based on the season, but the part that stuck out to me most was that all of the little rock islands were covered in turtles! Some rocks had as many as 6-8 turtles all piled together like Myrtle the Turtle!
Overall, this garden was a nice spot for a quick stop (an hour will get your around the whole thing easily) but also a place for a relaxed picnic. I suggest pairing a visit to the garden in the morning or at lunch time with a trip to the nearby contemporary art museum in the afternoon.